Frequencies for first 10,000 rows of rdlgy_srvc_cd variable in pos1997 dataset :

       srv: |
  radiology |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,456       94.56       94.56
          1 |        119        1.19       95.75
          2 |        418        4.18       99.93
          3 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017